Dynamo-electric machine.



J. D. PIRMIN.

ammo menus momma.

LIPLIOATIOI FILED FEB. 19, 1908,.

Patented May 18, 1909. 2 SHEETS-SHEET 1.

[man-- John B- Rrmm.

6 Q4 Ar'mmrsy- UNITED STATES PATENT OFFICE.

JOHN D. FIRMIN, OF NORWOOD, OHIO, ASSIGNOR TO THE BULLOCK ELECTRIFMANUFACTURING COMPANY, A CORPORATION OF OHIO.

DYNAMO-ELEGTBIG MACHINE.

Specification of Letters Patent.

Patented May 18, 1909.

Application filed February 19, 1906. Serial No. 301,747.

To all whom it may concern:

Be it known that I, JOHN D. FIRMIN, citizen of the United States, residiat Norwood, in the county of Hamilton and "tate of Ohio, have inventedcertain new and useful Improvements in DynamoElectric Machines, ofWhich;.the following is a full, clear, and exact specification.

My invention relates to improvements in dynamoelectric machines andparticularly to the means employed for holding the field coils ofthemachine firmly in place on the poles.

It is often the case that certain dynamoelectric machines, suchas milland railway motors, are subject to vibration and shocks which may have adetrimental eliect if the parts are not all firmly held in lace. Alsochanges in temperature and ot er climatic conditions have a tendency toloosen certain parts of the machines. Accordingly, under certaincircumstances, the field coils, which fij, closely upon the field polesor cores of the field magnets when the machines are first assembled,become loose and move on the poles, the insulationof the coils isabraded and punctured, and the coils hecomeground ed or short-circuited.

One of the objects of my invention is to avoid the difliculties aboveenumerated and to provide means whereby the coils can at any time betightened in case they become loose upon the poles.

A further object is to so clamp the coils to "the poles that each poleand its coil can removed together and without danger of the coilbecoming loose on the pole.

In carryin out my invention I rovide means on ea'c field pole for.drawin t e field coil onto a support or seat on the pee.

More speci cally considered, my invention consists in a dynamo-electricmachine having a field-fra e with inwardlv projecting laminated. fieloles rovide with end plates arid ole tips, 001 s on said poles, andmeans for c ampin the coils to the pole tips, said means inclu inclamping. ates etween the coils and t 1e frame, an bolts engaging theend-plates and the clamping plates.

My invention still further consists in certain novel detailslofconstruction and combinations and arrangements of parts described in thespecification and set forth in the appended. claims. Y

For a better understanding of my invention, reference is had to theaccompanying drawings, in which,

Figure 1 is a partial sectional view of a four-pole motore ui ped withmy invention, only two of the eld magnets of the motor being shown; Fig.2 is a slightly enlarged sectional elevation showing a field pole inside elevation and the coil and field frame in section; Fig. 3is a viewof a detached )ole, coil and clamping means, looking toward the outerend of the pole; Fig. 4 is a sectional elevation of the same, partsbeing broken away for the sake of clearness; Fig. 5 is a section througha modified form of a field pole showing the outer end of the coil inelcration and a modified form of clamping means; Fig. 6 is a sidesectional elevation of the same, parts being removed for the sake ofclearness; and Fig. 7 is a sectional end elevation of the same, the coiland the field frame being shown in section.

' Referrin to Figs. 1, 2, 3 and 4 of the drawings, have shownat 10 ashaft of the motor on which is mounted the armature 11. The surroundingfield frame 12, shown in section in Fig. 1 is rovided with a pluralityof field poles or field magnet cores ]3, a fourole machine being shownin the drawings. achfield pole consisting of laminaejl4 and end clamplnplates 15 is held to the field frame by bo ts 16 which are provided withenlarged heads 17 seated in recesses in the inner face of the pole. Inthe preferred form of my invention, the laminated field poles engageshort pole stubs or-pro'jections 18. on. the field frame. As is clearlyshown infFi s. 1and2 the laminated poles are provi ed with laterallyrojecting pole tips 19, each of which has a at ortion forming a su portor seat for a fiel coil 20 one oi whic surrounds each of the poles. -Inorder that the field coils maybe held securely and firmly in place on'the poles, whether the latter are attanhed to or detached from themachine, I provide means on the poles for clampinp the coils ontosupports orseats on the po cs, preferably adjatips. Each end-plate 15.isprovided near its inner-end with arr-enlarged portion 21 Wl'llCl'l iserforated and recessed to received the y and head of a clamping bolt.22'. Be-

tween-the frame and each coil and at opposite sides of each pole is aclam ing plate or member 23. This clam ing p ate which is shown mostclearly in ig. 3 extends along the ends of the coils and has pro'ectionsextending for a short distance along t e sides of the coils. Each claming plate has midway between its ends and extending between the coil andthe pole, a ribbed portion 24, shown in Fig. 2, which is enlarged at itscenter at 25, and provided with a threaded hole or opening to receivethe end. of the clamping bolt 22. It is seen that, when the parts areassembled, by means of the bolts which engage the extensions of theendplates, and b means of the clamping lates engaged by the bolts, thecoils can be drawn securely and tightly onto the pole tips, and in casethe coils become loose for any reason, as for example, shocks to themotor or severe changes in temperature, they can be tightened in place,by adjusting the clamping bolts 22.

In Figs. 5, 6 and 7, a modification of my invention is shown. The fieldframe, in this case has solid field poles 26,. which are rovided withlaminated pole shoes 27 hel in place on the poles by means of bolts 28,in

construction the coil either form of my invention,

the same manner that the laminated poles are held in place in theconstruction previously described. In this modification the coils arenot clamped to the pole tips, but are clamped to the end-plateswhich arepro vide with seats or su ports for that purpose. The combined end-plates and coil supports are shown at 29, the plates are held to theole-shoes by means of rivets 30, shown in ig'. 7 Each end plate orend-member is provided at its ends with enlarged flat coil supports 31,and midway. between its ends wit an enlarged perforated and recessedportion 32, to receive thebody and head of the clamping bolt 33. Theclamping members.34=, which are engfiiged ,by bolts 33, to clam thecoils onto t e supports or seats, are s ightly-difi'erent in shape fromthose in the construction first described. The clampin members 34whichare located at opposite si es of the' poles are each provided witha ribbed portion35 extending along the pole piece, and between the coiland the pole, and at its ends with enlarged flat portions 36, adapted toen age the. coil. The ribbed portion of each c 'auiping member isprovided atits center with an enlarged portion 37 having a tap ed orthreaded hole to receive the end of t e clamping bolt '33. In this 18supported at itsfour corners, and is clamped to the sup ortsby means ofthe bolts 33 and the c ampmg members 34. As inthe first case, by turningthe bolts 33, the coils can be adjustably clamped in place. 7 shouldthe. poles be. removed from the machine the coils will It is also seenthat, in.

be as securely clamped to the coil seats or sup orts as when the polesare on the frame of t e machine.

It is obvious that many changes or modifications-can be made in thedetails without departing from the spirit and scope of my invention, andI aim in my claims to cover all such modifications.

What I claim as new and desire to secure by Letters Patent is 1. In adynamo-electric machine, a field frame, a plurality of field poleshaving field coils, means for securing the poles to the frame, a fixedcoil support at the free end of each pole, and means independent of theframe and of the pole securing means for clamfiing coils to saidsupports.

2. n a dynamo-electric machine, a field frame, a plurality ofinwardlyprojecting field poles having fieldcoils, means for securing the polesto the frame, each pole having at its inner end a fixed coil support,and means independent of the frame and of the pole securing. means forclamping the coils to said supports.

3. In a dynamo-electric machine, a field frame, a plurality of fieldpoles having field end fixed rejecting portions, and adjustable means inependent of the frame for adjustably clamping the coils to saidportions.

4. 'In a dynamo-electric machine, a field frame, a plurality of inwardlyprojecting field'poles, fixed coil supports or seats at the inner end ofeach field ole, and adjustable means independent of t e frame foradjust-- ably clamping each coil to its an ports.

5. In a dynamo-electric mac me, a field frame, inwardly projecting fieldpoles, field coils thereon, fixed coil supports at opposite sides of theinner end of each pole, and adad justably clampin each coil to itssupports.

6. In a dynamo-e ectric machine, a rotary armature, a field frame, fieldpoles having field coils and fixed projecting ole tips,

and means independent of the frame and of the polesecuring means forclamping the coils to said pole tips.

In adynamo-electric machine, a field member, fie d poles havingpro'ectmg pole tips, coils on said field poles, an adjustable meansindependent of said member for adjustably clamping the coils tightlyagainst the pole tips.

8. In a d' name-electric machine, a field member, fie d poles havingprojecting pole tips at their inner ends, coils on said poles, and searate adjustable means on o posite sides 0 each pole for clamping the001 to the pole tips.

9. In a dynamo-electric machine, a field member having rejecting fieldpoles, co ls on said poles,' eadli pole having at or near itsjustable-means independent of the frame for coils, each field polehaving at or near its free ,means for securing the poles to t 1e frame,

.enga c said clampin free end a coil support or seat, and means forclamping the coils against the seats, said means including clampingmembers which engage the ends of the coils, and bolts which members andare 10- cate intermediate t 1e coilsand poles. 10. In a dynamo-electricmachine, a field frame having inwardly pro'ecting field oles, coils onsaid poles, each pol e havmg at its inner end coil su ports or seats,and means for holding the cor s to the supports or seat comprisingclamps which engage the outer ends of the coils, and bolts which extendalong the sides of the poles intermediate the latter and the coils.

11. In a dynamo-electricmachine, a field frame having inwardlyprojecting field poles,

coils on said poles, each pole having at ts'lin ner end on two op ositesidescoil supports or seats, and means or clampingeaohcoil to itssupports comprising clamps which engage the outer end of the coil, andbolts which extend along the other two sides ofthe pole intermediate thelatter and the coil. 3

12. In a dynamo-electric machine, a field frame having inward}? erejecting field poles each pole having a f d coil-and a pair o poletips, and adjustable means-for clampingthe coil to the pole tips, saidmeans comprising a pair of clam s and-a'pair of bolts.

13. In a dynamo-e ectric machme, a field frame, having inwardlprojecting field poles e tipsat the ends of the poles, and means for camping cash provided with field coi s, po

coil to the role tips, said means including a plurality oi independentmembers having coil clamping portions intermediate the frame and thecoil, and bolts which engage said memlz-ers and extend along the sidesof flu pnlr.

H. ln :1 rl \'nuinn-electric machine. a iicld frame, laminated fieldpoles having end-' tween the coil and the frame and bolts engaging theend-plates and the clamping plates. I

. 15. In a dynamo-electric machine, a field frame, inwardly. projectinglaminated field poles having end-plates and pole tips, a coil on eachpole, each end-plate having nearits inner en means for clamping the coilto thetips of the pole, said'means including a pair of clamping platesbet-ween the frame and the coil aml bolts enga ing.- he plates and theprojections on the en :plats.

16.- Tn a dynamo-electric machine, afield frame, inwardlytextendingfield -poles,'field coi'l sthereon, coil sup orts at the inner end ofeach field pole, en -plates on said poles, and means for clamping thecoils to said supports, said means including clam ing members betweenthe'coils and the -rame and bolts engaging thefend-platesand clampingmembers.

17: In a dynamo-electric machine, a field irame, inwardly extendinglaminated field poles havin pole tips and end-plates, coils onsaid 110es, andgmeans for adjusts-lily clamping saidcoils against the pole tips,said means including clamping members at the outer portions of the coilsand bolts engaging the clamping members and'end-plates.

In testimony whereof I aflix my signature, in the presence of twowitnesses.

JOHN D; FIRM] Witnesses:

Anruun F. Kw s, Fnnn J. Kmsnr.

a lateral projection, and adj ustablc

